JPH0232154B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that a collection chamber half disposed in a tubular body comprises:
It has an air access and air escape groove fluid-tightly separated by two parallel webs to the central air groove, these grooves are closed by a flange at the front and are connected to the central air groove via a transverse groove at the rear. The invention relates to an ink conduit for a tubular stylus of a writing instrument, consisting of a plastic element with a compensating system of laminar structure, which is connected to an air groove.

It is customary to use a helical compensation system in tubular styli, which includes the following: if the ink storage volume exceeds 1.5 ^cm3 , the helical system reacts very slowly to temperature fluctuations;
And undesirable drip formation occurs on the tip of the writing tube.

DE 32 05 800 discloses an inkjet ink having an intricate ink compensation means in the form of a spiral or, if provided with a longitudinal chamber, an axially movable drop weight with a cleaning wire and a writing tube. An ink conduit system for a drafting tool is disclosed. In that system, the ink compensation means has in its inner bore or the drop weight has at least one longitudinally subdivided capillary groove on its peripheral surface, the capillary groove having a relatively low capillary action ventilation capillary groove. from the connecting tube as a connecting capillary to a relatively narrow air control point located in the lower half of the ink compensation means, and passing under the ink controlling point to the writing tube as a connecting capillary with high capillary action, while axially An ink capillary oriented in communication with the air control point. The ink conduit system has no lamina, but a helical system.

The specification of West German Utility Model No. 7633429 relates to a writing tip for a tubular writing instrument with a drop weight and a compensating element, in which a spring-like connecting element provided between the drop weight and the compensating element is integral with both parts. configured or otherwise rigidly connected to both parts.

The object of the present invention is to reliably control ink volumes exceeding about 1.5 cm ³ , such as are required for example in non-refillable drafting instruments, and thus to react very sensitively to temperature fluctuations and to The object of the present invention is to propose an ink conduit system that embodies the vibration-resistant advantages of a helical system regardless.

To achieve this objective, the invention provides that the adjustment wire is held by a wire housing inserted into the large diameter central hole of the tubular body and the writing tube is inserted into the small diameter central hole of the tubular body. An annular gap is provided between the adjusting wire and the inner wall of the writing tube, which is guided along its entire length through the central hole, and this annular gap is connected to the conical hole at the rear end of the writing tube and the conical hole at the front end of the wire housing. The conical annular space is connected to the annular flat surface between the large-diameter center hole and the small-diameter center hole of the tubular body, and the wire housing. The flat annular space between the front end annular flat surface and the conical annular space communicate with each other at the outer periphery of the conical annular space, and this flat annular space is formed integrally with the annular flat surface of the central hole of the tubular body. The capillary annular gap between the outer surface of the wire housing and the center hole of the tubular body is adjacent to the flat annular gap created by the cam, and the inner wall of the center hole of the tubular body is further Longitudinal fins are provided which extend to the lateral capillary holes and serve to guide the wire housing closely, said lateral capillary holes extending from the outside to the central hole in the laminar region in front of the tubular body. A regulating gap is provided which passes through the tubular body at right angles and intersects said lateral capillary hole at right angles, the lateral capillary hole being connected to the storage tank via a capillary gap extending to its rear end in the laminar region of the tubular body. An annular flat surface at the front end of the wire housing connected to the cam and above the cam is formed to limit the stroke of the wire housing forwardly, and is in contact with the rear end of the wire housing to limit the stroke rearwardly. A plug having a front annular flat surface that can be rotated may be provided in the central hole of the tubular body.

Other advantageous further developments are described in the implementation section.

A similar system was published in West German Patent Publication No.
3338227, in which a compensating element with laminae is used, in which the approach of the air to the laminar system and the escape of the air from the laminar system are parallel to the central air groove. This is done by two air access and air escape grooves arranged.

This is achieved by lengthening the bayonet sleeve. That is, the head piece is lengthened by a tubular body formed with a system of laminae that is held in frictional engagement with the stud. This thin plastic element as a tubular body has a small central hole which serves to accommodate a writing tube. A small diameter central hole is enlarged toward the rear, and a wire housing is movably mounted therein. It is critical to the operation of this system that the capillary ink supply system that supplies ink between the annulus of the writing tube does not have any enlargements in any area. This is because the supply of ink to the annular space of the writing tube is threatened by the enlarged portion.

In the area of the perforation connecting the capillary gap communicating with the storage tank to the central bore of the tubular body, the movable mounting of the wire housing must ensure that the flow of ink does not stop abruptly at this point. When a drop weight is used, when the writing instrument is held diagonally, for example in a writing position, the wire housing closes the bottom hole of the writing tube, thereby abruptly stopping the flow of ink. In order to prevent this, in the present invention, a small width longitudinal fin is integrally formed in the central hole of the tubular body, thereby guiding the wire housing closely and preventing the writing tube hole from being closed. are doing.

Cost considerations would make it necessary to omit the drop weight and to provide only a spring, which is advantageously formed integrally with the plastic wire housing and which holds the adjusting wire in the correct operating position.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a plastic thin layer element 3 as a tubular body having a flange 3l, an adjustment gap 3f, an air groove 3g, a capillary gap 3d, a chamber 3n, a thin layer 3m, and a capillary groove 3s, a plug 8, and a writing tube. Consists of 1.

FIG. 2 shows a writing tube 1, a thin plastic element 3 as a tubular body, a flange 3l, a thin layer 3m and a chamber 3.
n, an air groove 3i, an air access/air escape groove 3h, a horizontal groove 3k, a plug 8, and a part of a storage tank 10 are shown. The web is indicated by 3t.

FIG. 3 is a longitudinal sectional view of the writing instrument. What can be seen are the writing tube 1 and its hole 1a, the annular gap 9a of the writing tube 1, the adjustment wire 5, the conical hole 1b of the writing tube 1,
Hole 3 of plastic laminar element 3 as tubular body
b, the conical annular space between the conical hole 1b and the cone 4a at the front end of the wire housing 4; the wire housing 4; the thin plastic element 3 as a tubular body; the thin plastic element 3 as a tubular body; Hole 3a, capillary annular space 9d, longitudinal fin 3
p, hole 4d of wire housing 4, outer diameter 4c of wire housing 4, stroke path 9e of wire housing 4, rear end 4e of wire housing 4, capillary groove 3
s, a drop weight 6, a capillary gap 3d, an air groove 3i, a plug 8 having a hole 8a and an annular flat surface 8b, a lateral groove 3k, and an air groove 3g. The capillary pore is denoted by 3e, while 3f denotes the accommodative hole. FIG. 3 also shows cross sections a-a, bb, c-c, d-
The cross-sectional positions of d, ee, and ff are also shown.

FIG. 4 similarly shows a longitudinal section of the writing instrument. The wire housing 4 can be seen in this figure together with the integrally formed plastic spring 4f. The cone of the wire housing 4 is indicated by 4a,
On the other hand, 8c is a spring 4 for the wire housing 4.
Identify the plug for the structure with f. Reference numeral 4b indicates the annular flat surface of the wire housing 4, and 9c indicates the flat annular space between 3c and 4b.
shows. 3c is an annular flat surface located between the large-diameter center hole 3a and the small-diameter center hole 3b of the tubular body 3. All remaining reference numbers correspond to FIG.

FIG. 5 shows a cross section a-a according to FIG. 3, in which the outer diameter 4c of the wire housing 4, the plastic laminar element 3 as a tubular body, the longitudinal fins 3p and the capillary ring gap 9d are shown. appear.

FIG. 5b shows a cross section b--b according to FIG. 3, but in which there is a drop weight 6, a wire housing 4, a chamber 3n, air grooves 3i and 3g and an air access/air escape groove 3h, an adjustment gap 3f and Capillary hole 3e is visible. 9d is the capillary ring, 3t
is the web. In the tubular body 3, each chamber 3n formed between adjacent thin layers 3m (FIGS. 1 and 2) each having an air access/air escape groove 3h is formed by ribs connected to each other via an arcuate portion. 3t, an air groove 3g, and a wall defining a capillary hole 3e to form two collection chamber halves.

FIG. 5c shows the cross section c-c, which includes the drop weight 6, the wire housing 4, the chamber 3.
n, air grooves 3i and 3g, air access/air escape groove 3h, and web 3t are also visible.

Figure 5d shows a cross section dd, in which the transverse groove 3k, the plug 8, the capillary gap 3d and the air groove 3g are visible.

Figure 5e shows the cross section ee, which includes the drop weight 6, the plug 8, the air grooves 3i and 3g,
The capillary gap 3d and the air access/air escape groove 3h are visible.

Finally, FIG. 5f shows the cross section f-f according to FIG.
The conical body 4a of the wire housing 4, the annular flat surface 3c, and the cam 3r formed integrally with this flat surface can be seen therein.

The operation of the ink conduit according to the invention is as follows.

The ink flows from the storage tank 10 to the capillary space 3d.
It flows into the capillary hole 3e, fills the adjustment gap 3f and the capillary groove 3s, and fills the capillary annular gap 9d and the flat annular gap 9.
c, it flows to the tip of the writing tube 1 via the conical annular space 9b and the circular space 9a. Finally, air groove 3
g is also partially filled with ink. When the ink is consumed during writing or drawing, a negative pressure is generated in the storage tank 10, which sucks the ink out from the air groove 3g and the adjustment space 3f, and between the air groove 3i and the air access/air The air present in the relief groove 3h can flow into the storage tank 10, and eventually pressure equalization takes place from the storage tank internal pressure to the surrounding air pressure. Once pressure equalization is achieved, the ink in the adjustment gap 3f closes the air access to the storage tank 10. When the air volume in the storage tank 10 increases due to heating or due to a pressure difference, the ink flows into the capillary groove 3s since the adjustment gap 3f is closed.
It then flows to the chamber 3n whose cross section decreases toward the rear and the air access/air escape groove 3h, and finally the pressure between the storage tank 10 and the surrounding air is equalized and the water drips onto the tip of the writing tube. formation does not occur. When ink is consumed by writing in this state, the ink first flows from the chamber 3n to the capillary groove 3s.
It is sucked out after. Only when the capillary groove 3s is emptied, the adjustment gap 3f opens a passage for air and air can enter the storage tank 10 via the air groove 3g. As a result, even tubular styli with a large filling capacity, for example in the case of non-refillable writing instruments, can be quickly and reliably controlled by this ink compensation system when pressure differences occur.
Drop formation does not occur. The vibration-resistant benefits of the helical compensation system are maintained despite being more sensitive to temperature fluctuations than conventional ink conduit systems.

In the present invention, the annular gap provided between the inner wall of the writing tube and the adjustment wire guided along its entire length through the center hole of the writing tube inserted into the small diameter center hole of the tubular body is provided in the writing tube. communicates with the conical ring between the conical hole at the rear end and the conical body at the front end of the wire housing;
Furthermore, this conical annular space is connected to the flat annular space between the annular flat surface at the boundary between the large and small diameter central holes of the tubular body and the annular flat surface at the front end of the wire housing, and the outer periphery of the conical annular space. Furthermore, the capillary annular space between the outer surface of the wire housing 4 and the center hole of the tubular body is adjacent to the flat annular space, thereby forming an ink flow path from the center hole of the tubular body to the tip of the writing tube. The writing instrument is secured by providing a cam integrally with the annular flat surface of the central hole of the tubular body and by providing longitudinal fins extending rearwardly from the inner wall of the central hole of the tubular body to the lateral capillary holes. It limits the movement of the wire housing when held diagonally, guides the wire housing closely, and prevents the central hole of the writing tube from closing, ensuring a regular flow of ink.

In this way, by securing an ink flow path from the center hole of the tubular body to the tip of the writing tube, we combined the structure to produce a stable and regular flow of ink, and the ink is flowed from the storage tank to the center hole of the tubular body. By having a compensation system formed in a thin layer connected to the flow path, even a tubular stylus with a large filling capacity can perform the above-mentioned action quickly, reliably, and vibration-proof when there are temperature fluctuations. controlled sexually.

[Brief explanation of drawings]

Fig. 1 is an external view of a writing instrument according to an embodiment of the present invention with the storage tank removed, and Fig. 2 shows the storage tank 10.
FIG. 3 is a longitudinal sectional view of the writing instrument, FIG. 4 is a similar longitudinal sectional view of the writing instrument, and FIG. 5a is a view taken along line a-a in FIG. 3. A cut cross-sectional view, Figure 5b, taken along line b--b in Figure 3.
Figure 5c is a cross-sectional view taken along line c-c in Figure 3; Figure 5d is a cross-sectional view taken along line d-d in Figure 3. , 5e is a cross-sectional view taken along line ee in FIG. 3, and FIG. 5f is a cross-sectional view taken along line ff in FIG. 3. 1... Writing tube, 3... Tubular body, 3a... Center hole, 3c... Annular flat surface, 3d... Between capillaries, 3
e...Side capillary hole, 3h...Air access/air escape groove, 3i...Air groove, 3k...Horizontal groove, 3l...
Flange, 3p...Longitudinal fin, 3r...Cam, 3t...Web, 4...Wire housing,
4b... Annular flat surface, 4c... Outer surface of wire housing, 4e... Rear end, 5... Wire, 8... Plug, 8b... Front annular flat surface, 9a... Annular space, 9b... Cone Between circular rings〓, 9c... Flat between circular rings〓, 9d... Between capillary rings〓, 9e... Stroke.

Claims (1)

[Claims] 1. The collection chamber half arranged in the tubular body 3 has an air access/air escape groove 3h separated from the central air groove 3i by two parallel webs 3t to prevent fluid leakage. of a writing instrument consisting of a plastic element with a compensation system of laminar structure, these grooves being closed at the front by a flange 3l and connected at the rear via transverse grooves 3k to a central air groove 3i. In the tubular stylus ink conduit, the adjustment wire 5 is connected to the large diameter center hole 3a of the tubular body 3.
The adjustment wire 5 and the writing tube are held by a wire housing 4 inserted into the tube and guided over the entire length through the center hole 1a of the writing tube 1 inserted into the small diameter center hole 3b of the tubular body 3. An annular gap 9a is provided between the inner wall of the writing tube 1 and the conical hole 1b at the rear end of the writing tube 1 and the conical hole 4a at the front end of the wire housing 4. 9
b, and further between this conical ring 〓
However, in the flat annular space 9c between the annular flat surface 3c between the large-diameter center hole 3a and the small-diameter center hole 3b of the tubular body 3 and the annular flat surface 4b at the front end of the wire housing 4, The conical annular spaces 9b communicate with each other on the outer periphery, and the flat annular spaces 9c communicate with the tubular body 3.
The cam 3r is formed integrally with the annular flat surface 3c of the center hole 3a.
9c is adjacent to a capillary annular space 9d between the outer surface 4c of the wire housing 4 and the center hole 3a of the tubular body 3, and further extends the inner wall of the center hole 3a of the tubular body 3 rearward into a lateral capillary. Longitudinal fins 3p are provided which extend up to the borehole 3e and serve to guide the wire housing 4 closely, said lateral capillary boreholes 3e extending from the outside into the central borehole 3a in the laminated region in front of the tubular body 3. An adjustment gap 3f is provided which penetrates laterally up to and intersects the lateral capillary hole 3e at right angles, and the lateral capillary hole 3e has a capillary gap extending to its rear end in the thin layer region of the tubular body 3. An annular flat surface 4b at the front end of the wire housing 4 connected to the storage tank 10 via 3d and above the cam 3r is formed to limit the stroke 9e of the wire housing 4 forward, and also to restrict the stroke 9e to the rear. An ink conduit, characterized in that a plug 8 is provided in the central hole 3a of the tubular body, which has a front annular flat surface 8b which can be brought into contact with the rear end 4e of the wire housing 4 in order to restrict the flow. 2. Ink conduit according to claim 1, wherein the drop weight 6 held in the wire housing is supplemented or replaced by a spring 4f. 3. Ink conduit according to claim 1 or 2, in which the chamber 3n of the compensation system is rearwardly stepped and has a relatively small cross section.